We found this simple toy organ circuit in the February 1968 issue of Radio Electronics magazine. The transistors were common at the time and the transformer was from a transistor radio output.
We found this interesting timer circuit or CMOS timer in a 1988 publication. The circuit is still...
This circuit was found in a 1997 documentation. The signals are adjusted in a double 555 (556) and the...
This circuit is from a 1993 Italian magazine, but it can be easily assembled today. For 110 V,...